Captures the single-stream flow-control ceiling as a known constraint with
the recursive-composition escape hatch: parallel throughput comes from N
independent channels connections (client optimization), not cross-connection
tokens or channels-layer coordination. Pins that the channels layer does no
cross-connection channels, no cross-connection primitives, and no parallel-
transfer optimization — those are downstream client concerns.
glm-5.2
12cf8aa0bd